The ANT+ Micro USB adapter allows on-the-go devices (OTG), such as your Android phone or tablet, to connect to an ANT+ USB stick. Android OTG compatible devices require ANT+ Radio Service and ANT+ USB Service to be installed from the Google Play store. These services allow the adapter to work correctly with an ANT+ USB stick.

No matter your skill level or experience on the bike, there's no better way to enhance your training and racing performance than by riding with a power meter. Lucky for you, Specialized has combined their incredibly light and stiff carbon fiber S-Works road cranks with dual-sided power measurement, making it the lightest (440g/172.5mm) and most accurate power meter available.
The development of Power Cranks began with Specialized's Human Performance Team looking at riders in realistic scenarios on the bike. Historically, power meters have been validated by two different methods—one is by measuring the produced torque by applying a static, linear load to a crankarm or chainring, while the second uses a power generating motor to pedal the bike. Well, cycling is neither static nor linear, and humans apply power much differently than a machine. So, they found that neither of these methods answer the "real-world" accuracy question.
To get the best test for accuracy, in all types of riding scenarios, Specialized built their own cycling treadmill, the WinMill, to measure power output to a known truth. This new benchmark lets them evaluate accuracy under all riding conditions—seated versus standing, various power and cadence levels, different weights, and a myriad of gear. This data acquisition process is their gold-standard for testing power meters, and through their testing and external validation from the Locomotion lab in Boulder, Colorado, Power Cranks have been proven to have the highest accuracy in real world scenarios (+/- 1.5%).
The Dual-Sided S-Works Power Cranks utilize separate strain gauge systems to individually measure the effort produced by each leg. This maximizes the accuracy of your total power numbers, plus it helps you to better understand your performance as fatigue increases and when you're recovering from injury. And with class-leading temperature compensation firmware and waterproof enclosures, Power Cranks are easy to live with. Calibration is only required during seasonal-type fluctuations in temperature, and the included wrench makes battery swaps a breeze.
- +/-1.5% real-world accuracy tested on the WinMill and validated by the Locomotion Lab in Boulder, CO.
- Independent, dual-leg power measurement.
- Works with ANT+ and Bluetooth devices.
- Easy set-up and diagnostics with the Specialized Power app. (iOS and Android versions available).
- Hollow carbon crankarms, carbon spider, and oversized alloy spindle offer superior stiffness and lighter weight than the competition—440 grams for 172.5mm crankarm length.
- Fits Specialized road frames with OSBB or PF30 bottom bracket shell, as well as most BB30 road frames.
- 110 BCD carbon spider (also compatible with 130 BCD carbon spider—sold separately).
- Compatible with Shimano and SRAM drivetrains. Chainrings are sold separately. Use only with Specialized/Praxis chainrings 06217-1702 (52/36T) and 06218-1713 (50/34T).
- Available in 165-180mm crankarm lengths.

The crankset is the heart of your bicycle and where you’ll find the SRAM RED Quarq power meter. The sole job of the crankset is to convert the effort from both legs to forward motion. It is the perfect place to measure power. This power meter works for every discipline: Road, triathlon, time trial, and cyclo-cross. The chainrings are replaceable should your bike, discipline, or ability change.
- A direct force power meter that measures total power output from both legs with +/-1.5% accuracy
- Works for every discipline: Road, triathlon, time trial, and cyclo-cross
- No compromises on materials, shifting, wheels, or pedal choice
- Proven by pro teams and athletes throughout the world – Cobbled Classics, Giro d’Italia, Tour de France, Vuelta a España, World Championships
- Number 1 at the Ironman World Championship for the last three years
- Uses a hidden bolt to mount the chainrings – compatible SRAM chainrings ensure the derailment pin lines up behind the crank arm
- 10K – programmed with over 10,000 data points to eliminate temperature effects on power measurement
- AxCad – A multi-axis accelerometer switches the power meter on and measures cadence, simplifying installation and operation
- Breakthrough Materials – Exogram hollow carbon fiber crank arms – the lightest, strongest crank arms SRAM makes – minimize weight and maximize speed [ELSA RS, ELSA R and SRAM RED]
- Easy to use (and reuse) – LED indicator and visible ANT+ ID
- The replaceable CR2032 battery never leaves you without power
- Manual and automatic zeroing make it truly set and forget
- Built to Last – IPX7 waterproof rating, 2-year warranty, free firmware updates, and acclaimed international support
- Moves with you from bike to bike
- With Quarq's free Qalvin app – available for Windows, Mac, iOS and Android – you can set the zero offset, check battery voltage, run diagnostics, and perform firmware updates for free
Arm Material: Carbon arms, Machined alloy spider
Weight: 778 grams (GXP 172.5mm 53x39 BB not included)
* Chainrings and BB sold separately

When Quarq set out to build their next-generation power meter, they wanted to build the best-performing power meter for every facet of cycling and triathlon, and for riders at every level. Like its Quarq brethren, the new DFour measures power in the heart of the bicycle — the crankset spider, scientifically proven to be the place for the most accurate measurement. With a new measurement circuit, revised strain gauge design, improved accuracy throughout the pedal stroke and software advances built into the Qalvin App, the DFour represents the state of the art in power meter technology. Every innovation in Quarq’s next-generation DZero platform is channeled into the DFour Power Meter Crankset. It embodies 10 years of Quarq technology advances with new features such as dual Bluetooth low energy and ANT+ wireless data transfer, the new Qalvin BLE app and compatibility with BB386EVO bottom brackets.
- The DFour power meter is a bolt-on upgrade for Shimano’s 11-speed Dura-Ace 9000, Ultegra 6800 and 105 5800 drivetrains.
- Must be paired with a compatible SRAM bottom bracket.
- ELSA RS power meter owners can upgrade using the DFour Power Meter Spider.
- Free firmware upgrades with the Qalvin app.
- Compatible with BB30 bottom bracket.
- BB30 versions ship with the spacers and wave washer required for BB386EVO installation.

Garmin brings power to the pedal with the Vector 2. Built in conjunction with Look Keo pedals, the Vector offers precise power measurement in a rugged, ultra-convenient, discreet package. Garmin encased sensitive strain gauges inside the stainless steel pedal spindles for years of durability and accuracy to within +/- 2%. The Vector is essentially two separate power meters and measures power from both legs, meaning you have the data to correct discrepancies between your left and right sides. Now you can eke out those last few watts and maximize your pedaling economy. The robust Vector 2S pods are easy to mount, and have a status light indicating when they're on and pairing occurs. Switching the pedals and pods between bikes is blissfully hassle-free and takes less time than getting kitted up. The pedal bodies are built of tough, light carbon, while the battery/ANT+ pods hang protected beneath the crank arms. At a nimble 312 grams including pedal weight, the Vector is one of the lightest power meters available.

When Quarq set out to build their next-generation power meter, they wanted to build the best-performing power meter for every facet of cycling and triathlon, and for riders at every level. Like its Quarq brethren, the new DZero measures power in the heart of the bicycle—the crankset spider, scientifically proven to be the place for the most accurate measurement. With a new measurement circuit, revised strain gauge design, improved accuracy throughout the pedal stroke and software advances built into the Qalvin App, the DZero represents the state of the art in power meter technology
As Quarq’s next generation of power meters, the DZero combines 10 years of technology advances with new features such as dual Bluetooth low energy and ANT+ wireless data transfer, the new Qalvin BLE app and, for the carbon version, compatibility with BB386EVO bottom brackets.
- 10K temperature compensation: Eliminates variables caused by heat and cold to provide an unwavering record of your performance through all conditions
- Built to last: Features an IPX7 waterproof rating
- Material: CNC Machined Aluminum Spider, Exogram Carbon Crank Arms
- Accuracy: 1.5%
- Bolt Circle Diameter: 130 BCD, 110 BCD
- Q-Factor: 145mm
- Wireless Technology: ANT+, Bluetooth low energy technology
- Battery: CR2032, 200 hours of riding time
- Weight: 578/559 grams (130/110 BCD)
- Head Unit Compability: ANT+ and Bluetooth low energy technology compatible head units (available separately)
- Compatibility: Traditional 5 bolt chainrings from most manufacturers. Hidden (HB) and Non-hidden Bolt (NHB) patterns. 10-speed, 11-speed, 1X and 2X. *Not compatible with Campagnolo chainrings

When Quarq set out to build their next-generation power meter, they wanted to build the best-performing power meter for every facet of cycling and triathlon, and for riders at every level. Like its Quarq brethren, the new DZero measures power in the heart of the bicycle — the crankset spider, scientifically proven to be the place for the most accurate measurement. With a new measurement circuit, revised strain gauge design, improved accuracy throughout the pedal stroke and software advances built into the Qalvin App, the DZero represents the state-of-the-art in power meter technology
As Quarq’s next generation of power meters, the DZero combines 10 years of technology advances with new features such as dual Bluetooth low energy and ANT+ wireless data transfer, the new Qalvin BLE app.
- 10K temperature compensation: Eliminates variables caused by heat and cold to provide an unwavering record of your performance through all conditions
- Built to last: Features an IPX7 waterproof rating
- Bluetooth low energy technology and ANT+ wireless data transfer
- Battery: CR2032, 200-hour battery life, change without tools
- OmniCal: swap chainrings without affecting accuracy
- 2-year warranty
- IPX7 waterproof rating
- Accuracy within 1.5%
- Bottom Bracket Compatibility: BB30
- Forged aluminum models do not work with BBright or BB386EVO bottom brackets

The SRAM RED AXS power meter breaks with tradition — and breaks through to new levels of performance. SRAM reengineered road gearing: reducing front chainring size and adding more range to the rear cassette. They also maintained a 13-tooth delta on all chainring pairs, ensuring precise shifting for any setup. This results in more useful gearing and better shifting across all configurations. These power meters are also designed with Quarq's premier DZero power measurement technology fully integrated into the crankset. Welcome to the pinnacle of the power meter.
- X-Range gearing technology gives you more range and a smoother gear progression, so you're always in the right gear
- Integrated power measurement
- Power meter is fully integrated into the chainring set for lighter weight
- Power readings are accurate within +/-1.5% and aren't affected by climate conditions during a ride
- Power balance measures left and right legs separately
- Improved front shifting performance for crisp and accurate front shifts
- Unique chainring shape results in a lighter weight, stiffer, more durable crankset
- Integrated chainring design significantly reduces weight
- DUB bottom bracket adds durability, simplicity and broad compatibility
- Speeds: 12
- BB Compatibility: All SRAM Road DUB BBs
- BB Spindle Interface: DUB
- Chainring material: Aluminum
- Crank arm material: Carbon
- Power Meter Type: ANT+ and BLE
- Bottom bracket not included

Real time data, full time training: Garmin's Edge 1000 helps you connect, compare, and compete. Wireless connectivity via Bluetooth and ANT+ gives you access to on-ride competitions through Garmin Connect, Smart Notifications from your phone, and real-time segment and leaderboard updates. This module is also pre-loaded with Garmin's Cycle Map, complete with road and bike path data, elevation, points of interest, and address search. Mapping data is stored onboard the Edge 1000, so feel free to explore outside of cell coverage. The Edge 1000 features the same quality and specs you've come to expect from Garmin: a three-inch, high-resolution touchscreen, complete cycle computer functionality, GPS mapping and tracking, Virtual partner, and Advanced Workouts for customized, goal-oriented training. The rechargeable lithium-ion battery has up to 15 hours of life, and the Edge 1000 comes with traditional and out-front handlebar mounts.

When Quarq set out to build their next-generation power meter, they wanted to build the best-performing power meter for every facet of cycling and triathlon, and for riders at every level. Like its Quarq brethren, the DFour measures power in the heart of the bicycle—the crankset spider, scientifically proven to be the place for the most accurate measurement. With a new measurement circuit, revised strain gauge design, improved accuracy throughout the pedal stroke and software advances built into the Qalvin App, the DFour Spider represents the state of the art in power meter technology
- The DFour Spider is a bolt-on upgrade for Shimano’s 11-speed Dura-Ace 9000, Ultegra 6800 and 105 5800 chainrings.
- Bluetooth low energy technology and ANT+ wireless data transfer.
- 10K Temperature Compensation.
- Battery - CR2032, 200-hour battery life, change without tools.
- OmniCal - swap chainrings without affecting accuracy.
- IPX7 waterproof rating.
- Accuracy within 1.5%

Upgrade your Vector S pedal-based power meter to the dual-sensing Vector 2S system. Garmin's Vector S to Vector 2S Upgrade Kit can accommodate both standard (12-15 mm) and large (15-18 mm) crank arms. Upgrading allows you to take that next step in performance by measuring the power from both legs, which can reveal strength deficiencies between your left and right side.

Benefit from tracking the most interesting, accurate, valuable, motivating and fun information while you're riding your Kinetic trainer with their inRide Watt Meter. It uses Bluetooth communication technology to pair a power sensor pod with Kinetic's inRide iPhone app so you can track your wattage with any Kinetic fluid trainer (smartphones and trainers sold separately). Tailor your workouts to meet your riding goals by logging your entire workout history, and even email your data to a coach for analysis, training, and planning. With the easy-to-install sensor and quick-download app, you'll be rolling and logging data in no time.

With Garmin's Vector 2S you'll find yourself breaking through mental barriers and eking out those last few watts. The Vector 2S offers precise power measurement of your left leg and uses that information to approximate your total and average power. All of this comes in a rugged, ultra-convenient, discreet package that's integrated with a Look Keo Pedal. Garmin encased the sensitive strain gauge inside the stainless steel pedal spindle for years of durability and accuracy to within +/- 2%. The pedal bodies are built of tough, light carbon, while the battery/ANT+ pod hangs protected beneath the left crank arm. The robust Vector 2S pod is easy to mount, and has a status light indicating when it's on and pairing occurs. Switching the pedals and pod between bikes is blissfully hassle-free and takes less time than getting kitted up. Garmin also offers you the ability to upgrade to the dual-sensing Vector system which provides additional data about the power produced by each leg.

Whether you're looking to take your training to the next level or you simply want a better way to measure energy expenditure, a power meter is your best bet. And the Power Cranks 105 Upgrade Kit are no exception. With our lightweight power sensors on a Shimano 105 crankarm, it's the perfect way to enter the power meter game.
The development of Power Cranks began with our Human Performance Team looking at riders in realistic scenarios on the bike. Historically, power meters have been validated by two different methods—one is by measuring the produced torque by applying a static, linear load to a crankarm or chainring, while the second uses a power generating motor to pedal the bike. Well, cycling is neither static nor linear, and humans apply power much differently than a machine. So, we found that neither of these methods answers the 'real-world' accuracy question.
To get the best test for accuracy, in all types of riding scenarios, we built our own cycling treadmill, the WinMill, to measure power output to a known truth. This new benchmark lets us evaluate accuracy under all riding conditions—seated versus standing, various power and cadence levels, different weights, and a myriad of gear. This data acquisition process is our gold-standard for testing power meters, and through our testing and external validation from the Locomotion Lab in Boulder, Colorado, Power Cranks have been proven to have the highest accuracy in real-world scenarios (+/- 1.5%).
The Power Cranks are also easy to live with, with class-leading temperature compensation firmware and waterproof enclosures. Calibration is only required during seasonal-type fluctuations in temperature, and the included wrench makes battery swaps a breeze.
- +/- 1.5% real-world accuracy tested on the WinMill and validated by the Locomotion Lab in Boulder, CO.
- Works with ANT+ and Bluetooth devices.
- Easy set-up and diagnostics with the Specialized Power app. (iOS and Android versions available).
- Shimano 5800 generation 105 left-side power measurement.
- Right crankarm and spider NOT included.
- Available in 170-175mm crankarm lengths.

Whether you're looking to take your training to the next level or you simply want a better way to measure energy expenditure, a power meter is your best bet. And the Power Cranks Ultegra Upgrade Kit are no exception. With our lightweight power sensors on a Shimano Ultegra crankarm, it's the perfect way to enter the power meter game.
The development of Power Cranks began with our Human Performance Team looking at riders in realistic scenarios on the bike. Historically, power meters have been validated by two different methods—one is by measuring the produced torque by applying a static, linear load to a crankarm or chainring, while the second uses a power generating motor to pedal the bike. Well, cycling is neither static nor linear, and humans apply power much differently than a machine. So, we found that neither of these methods answers the 'real-world' accuracy question.
To get the best test for accuracy, in all types of riding scenarios, we built our own cycling treadmill, the WinMill, to measure power output to a known truth. This new benchmark lets us evaluate accuracy under all riding conditions—seated versus standing, various power and cadence levels, different weights, and a myriad of gear. This data acquisition process is our gold-standard for testing power meters, and through our testing and external validation from the Locomotion Lab in Boulder, Colorado, Power Cranks have been proven to have the highest accuracy in real-world scenarios (+/- 1.5%).
The Power Cranks are also easy to live with, with class-leading temperature compensation firmware and waterproof enclosures. Calibration is only required during seasonal-type fluctuations in temperature, and the included wrench makes battery swaps a breeze.
- +/- 1.5% real-world accuracy tested on the WinMill and validated by the Locomotion Lab in Boulder, CO.
- Works with ANT+ and Bluetooth® devices.
- Easy set-up and diagnostics with the Specialized Power app. (iOS and Android versions available).
- Shimano 8000 generation Ultegra left-side power measurement.
- Right crankarm and spider NOT included.
- Available in 170-175mm crankarm lengths.

Power to the people! Add the Pioneer Power meter to your existing Shimano crank. Pioneer's crankset-based power meters are simply some of the best power-monitoring systems on the planet, and the Upgrade Kit gives you the chance to add it to your existing crankset. At the heart of the Pioneer Power Meter System are two streamlined strain gauge monitors that can detect the slightest tangent and radial force direction as power is applied to the crank arms. This proprietary system detects the amount and the direction of force at 12 different points in each pedaling stroke for each leg, and allows you to fine tune your pedaling to find race-winning form. The Pioneer Power Meter Installation Kit comes with everything you need to package and send your existing Shimano crank to Pioneer for professional installation and calibration.
- Compatible with Shimano Dura-Ace 9000 or Ultegra 6800 (Right Side Cranks Only)
- Compatible Crank-arm Lengths: 165, 167.5, 170, 172.5, 175, 177.5, 180mm
- Fully Integrated Strain Gauge for force measurement
- Easy connectivity with ANT+ compatible Cycle Computers
- HDPower Metrics when connected to Pioneer Cycle Computers
- Lightweight Sensor Only 40 grams

No matter your skill level or experience on the bike, there's no better way to enhance your training and racing performance than by riding with a power meter. And for all of you Dura-Ace fans out there, we've combined our extremely light power sensors with a Shimano Dura-Ace crankset to give you the most accurate and precise power meter available.
The development of Power Cranks began with our Human Performance Team looking at riders in realistic scenarios on the bike. Historically, power meters have been validated by two different methods—one is by measuring the produced torque by applying a static, linear load to a crankarm or chainring, while the second uses a power generating motor to pedal the bike. Well, cycling is neither static nor linear, and humans apply power much differently than a machine. So, we found that neither of these methods answers the "real-world" accuracy question.
To get the best test for accuracy, in all types of riding scenarios, we built our own cycling treadmill, the WinMill, to measure power output to a known truth. This new benchmark lets us evaluate accuracy under all riding conditions—seated versus standing, various power and cadence levels, different weights, and a myriad of gear. This data acquisition process is our gold-standard for testing power meters, and through our testing and external validation from the Locomotion Lab in Boulder, Colorado, Power Cranks have been proven to have the highest accuracy in real-world scenarios (+/- 1.5%).
The Dual-Sided S-Works Power Cranks utilize separate strain gauge systems to individually measure the effort produced by each leg. This maximizes the accuracy of your total power numbers, plus it helps you to better understand your performance as fatigue increases and when you're recovering from injury. And with class-leading temperature compensation firmware and waterproof enclosures, Power Cranks are easy to live with. Calibration is only required during seasonal-type fluctuations in temperature, and the included wrench makes battery swaps a breeze.
- +/- 1.5% real-world accuracy tested on the WinMill and validated by the Locomotion Lab in Boulder, CO
- Independent, dual-leg power measurement
- Works with ANT+ and Bluetooth devices
- Easy set-up and diagnostics with the Specialized Power app. (iOS and Android versions available)
- Available in 170-175mm crankarm lengths
- All models include 52/36T chainrings